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6 – Modelling 6.1.3.2 Energy Equations Each gas cooler unit was divided into a fixed number of sub-sections, and the thermophysical properties of the fluids were treated as constant within each sub-section. Figure 6.3 sketches the principle of the inlet and outlet conditions for one gas cooler sub-section. The subscripts H and C refers to the hot flow (CO2) and cold flow (water), in and out refer to the inlet and outlet of the sub-section, whereas T is the temperature and CP is the product of the mass flow rate m& and the specific heat capacity cp (ref. Eq. A5, Appendix A2.4). CO2 Water TH,out TC,in CPC Figure 6.3 TH,in CPH TC,out Principle of a gas cooler sub-section. The thermodynamic and transport properties of pure CO2 were supplied by the library xlco2lib.dll (Skaugen 2002), where the data are based on correlations from Span and Wagner (1996), Vesovic et al. (1990) and Fenghour et al. (1998). The thermodynamic and transport properties of water were based on data from the VDI Heat Atlas (1993). Since the specific heat capacity of the fluids within each gas cooler sub- section was considered as constant, the UA-LMTD method was used for calculating the energy equations (Stoecker, 1989): where: Qtot =U⋅Ai ⋅LMTD CP =(m⋅c ) 174 Q=CP⋅(T −T ) &H H H,in H,out Q=CP⋅(T −T) &C C C,out C,in & (6.4) (6.5) (6.6) (6.7) (6.8) H&pH CP =(m⋅c ) C&pCPDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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